phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c8ce6c0354b915944f925c76f5afc7e0' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c8ce6c0354b915944f925c76f5afc7e0', -1, 1772362975, 1772362975, 'd849d871', -4, 0, 0)

Line : 187
File : sessions.php